Yes they are losing income as it has 5SL but the fact is 10GS are all used by general tickets and is not empty the same thing with Guntur Rayagada. As the train has 20 add 3SL and 3AC and 8 GS and make it 22 coach to increase income. 3 months back I was traveling by bus from kotipalli to KKD and there are group of 6 going to board this train in general to Tirupati and go by walk to Tirumala.